Synchrony Bank formerly Care Credit Holding bill until interest is charged Bridgewater New Jersey

Back when it was Care Credit, I tried repeatedly to pay my bill online, and it kept reporting that I did not owe them anything yet. Finally, to avoid interest charges, I sent a check. On the same day I got the check back from the stating I did not owe anything, they charged me interest because I had not paid the bill on time. My protests went unheard.

So now I run into the bank again when I applied for Amazon credit. Again. I tried to pay my bill, but it would not let me into the account. The third conntact made with their help desk, I finally managed to be insistent enough that they let me pay it, as it turned out, they could have done the first time I called. I cancelled my card.

I am curious to know if this is a policy to increase their revenue.